I didn't get any e-mails from the DDP. The phone just appeared in my eStore. The eStore should appear as a tab in Forum Nokia once you become a Pro member. I went there and it only has an unrelated phone and some support options. Upon hitting the refresh button in my browser, the N900 mysteriously appeared.

EDIT: The eStore is found under the "Premium Services" tab. It is the last of the gray links under the tabs when you go there.